Dam Safety Case History Columbia Lock and Dam March 8, 1997 “A number of courageous people worked in sometimes dangerous circumstance to perform their missions. We are grateful that throughout all of this no one was injured and we were all successful in our efforts.” CCHamby 97 CCHamby 97

Location Map 2 Columbia L&D Thatcher L&D Felsenthal L&D Jonesville L&D

Columbia L & D Descript 84’ x 600’ Lock Wide Tainter Gates 200’ Wide Navigation Pass Guide Wall Flow West Abutment Miter Gate

The Accident

Columbia Lock and Dam 8 March 97 9pm

Columbia Lock and Dam

10pm

1am 9 March 97

Columbia Lock and Dam

2:45am

6am

Photo Barge in Gate 1 photo 10 Mar 97

Photo Barge in Gate 1 10 Mar 97

Photo Barge in Gate 1

Gate 1 Damage

Barge Removed from Gate 1 photo 11 Mar 97

Barge Removed

Identifying the Problems Remove Two Sunken Barges Damaged & Inoperable Tainter Gate Too Much Flow thru the Nav Pass The River Forecast is Bad News There is no heavy equipment upstream

Lock Underwater ___ photo fig II-1 (where is the lock?)

Lock Underwater ___ photo fig II-2 Highway Barriers Lock Chamber Miter Gate

Highway Barriers Borrow from LADOTD

Highway Barriers ___ photo fig II-3

Highway Barriers ___ photo fig II-4

Miter Gate Extension Designed and Built Wooden Extension __photo fig II-5

Miter Gate Extension Fig II-6 9 Apr Timber over miter gate and barriers along the wall

Operating the Lock __photo fig II-7 opening the gate valves

Passing the Salvage Derrick Barge __photo fig II-8 derrick barge goes through the lock

Salvage Ops Orientation of barges fig IV-2

Salvage Ops ___ fig IV-1

Salvage Ops – Ent Pipe Sktch Sketch diver going through the pipe to cut holes

Salvage Ops – Ent Pipe Phot0 ___ figs IV-3 pipe in water

Salvage Ops - Diver Photo diver going through the pipe to cut holesPhoto diver going through the pipe to cut holes

Salvage Ops - Tender Photo diver going through the pipe to cut holesPhoto diver going through the pipe to cut holes

Salvage Ops - Spectators TV Media Spectators photo

Salvage Ops – Barge Exposed ___ figs IV-4

Salvage Ops – Barge Rising ___ figs IV-4

Salvage Ops – Barge Raised ___ figs IV-4

Salvage Ops- Chain Connection ___ figs IV-x

Stone Repairs Sketch 1 Show plan view sketch of all holes

Stone Repairs Sketch guideWx

Stone Repairs Sketch tainterx

Stone Repair Photo new stone

Stone Repair Photo drop stone

Stone Repairs Sketch US fix x

Stone Repairs Sketch nav x

Navigation Pass Flow __photo fig II-10 water thru nav pass 9Apr add sound from VHF tape

Navigation Pass Damage __photo fig II-10 9 Apr Additional Surveys made after river slowed down Slab fell into the hole (show 3D survey or fig III- 10) Show cross section with hole and stability prob

Stone Repairs Sketch nav orig

Stone Repairs Sketch nav hole

Navigation Pass Repair Photo __photo 30 May

Bent strut frame

Bent strut frame measurements

Gate Damage Trunion bolts Center hole jack

Installed Stop logs Fig IV-14 ___

WorkBarge Bullet ___

Second Barge Flips on to it’s Side 8 June 97

Secure the Trunion Bullet ___

Marking the VEE

Restraints Restraint Applied

Gentle Force Tightening Up the Restraint

Heat the VEE’s photo

Shrinking the Vee’s Shrinking the Vee’s – Cooled by Pressurized H 2 O

Job Done photo

Gate 1 Before Before

after Gate 1 After Brace Cover Plate After

Summing it up $1.25m Overall Repair Expense